Let-off mechanism for looms



May 20, 1930. w. s. wl-:ITLs

LET-OFF MECHANISM' Foa Looms Filed Sept. 5. 1928 mvfwron. WWA-m ,S Mons.B

' Afro/mfr.

latentecl May 20, 1930 I.

WILLIAM S. WELLS, LOS ANGELES, CALIFORNIA, ASSIGNOR, BY`1VIESNE ASSIGN-MENTS, TO WONDER WEAVE, INC., OF MASSACHUSETTS OF BOSTON, MASSACHUSETTS,A CORPORATION LET-OFF MECHANISM FOR LOOMS Application led September 5,1928. Serial No'. 304,060.

This invention relates to means for letting i v off yarn or the like,strips, etc., from a wound mass thereof and at the same time preservingtension thereon. The principal object is to provide for perfectuniformity of tension regardless of the let-off action and of otherinfluences tending to vary the tension as, for

l wise displacement.

example, when the material is a warp in a loom and so is subject to theshed-forming movements of the loom harness.

Figs. 1 and 2 are a rear and a side elevation of the mechanism, Fig. 2showing the housing cover 2x1 removed;

Fig. 3 is a section on line 3'-3, Fig. 2, eertain parts appearing inplan. y v

Figs. 1 to 3: 1 is any suitable frame and 2 a housing at one sidethereof having a removable cover 2a. Journaled in the housing on a stud3 is the rotaryelement consisting of a pinion 4 and a pair of oppositestoparms 5. Journaled in the housing on a stud 6 is a gear membercomprising a gear-7, meshing With pinion 4, and a pinion 8. Journaledinthe housing and also in open bearings in the frame is the shaft 9 for abeam 10 on which the mass of warp threads (here a multiple of them) iswound, said shaft having a gear 9a in mesh with pinion 8 and also aspline 9* with which the beam engages and which may equal yin lengthlthe space vbetween the bearings and thus hold: the shaft against end-The housing and said shaft form in effect a unitary structure which isremovably supported in the frame thus: The shaft is held in itsbearings-,by pivoted caps 11 which may be swung down, to clear theshaft, upon withdrawing thumb-screws 12 engaged with the caps. Thehousing'has a stud 13 formed with a reduced portion 0r neck 13a receivedin a hook 14 forming a rigid projection of the frame. Said struc' tureis thus supported by the 'bearings and the. hook and upon swinging downthe caps it 4 may be removed, as when replenishing of the warpisnecessary.

The brake-member is here a pawl .pivoted in the housing and whosepawl-arm 16 normallyfrests, here, by gravity as well as under the pullof a spring 16h, against a stop 17, in braking or rotation-opposingrelation to (one of the arms 5 of) said rotary element, but movabletherefrom to clear the same; for eii'ecting such movement the pawl mayhave an additional arm 16a.

The means thus to move the brake-member here consists of a leverstructure 18 fulcrumed at 19 in the frame, a chain 20 or other licxibleconnection connecting itwith arm 16a of the brake-member, and aroller 21journaled on the lever. The lever, which in" this 'example overhangs thebrake element, tends to fall by gravity, but its tendency to movedownward may be augmented by a spring 22v having an' adj Listing-screwconnection 22 with the frame. The Warp extending from the beam reachesover two rollers 23 journaled on the frame and between them it extendsunder roller 21.

lVhen the Warp is drawn upon tension is established, by the means18-21-22, which exerts bend-forming pressure on the warp. rlhe Warpbeing drawn upon and overcoming this pressure moves said means until thelat ter finally moves the brake-member to the position Where it releasesthe rotary element, which is operatively connected With the rotary woundmass, through the gearing, such release of the rotary element of courseresults in a more or less rotation of the wound mass, paying out thewarp, with incidental reaction of the mentioned means and consequentre-establishing of the braking condition. Thus, while lettingoif isautomatically laccomplished, the tension is at all times equable, thelatter being principally due to the said means being movableindependently of the brake-member.

By geariiig-do\vn,)from the rotary member 9&-9 on which the wound massis wound to the rotary element the brake element (if of the positivetype, asin the examples set forth) is more delicately responsive torelease by the warp and the shocks incident to its checking actionappreciably reduced.,

Having thus fully described my invention, what I claim is: l

1. In combination, a loom frame, a unitary structure removably supportedtherein and comprising a support arranged at one side of the frame, arotary warp-beam receiving member journaled in the sup ort andprojecting from the side thereo next to the frame and having means tointerlock it with the beam for rotation therewith, and warp controlledmeans on the support. to releasably hold said member from rotation.

2. In combination, a loom frame, a unitary structure comprising asupport arrangedl at one side of the frame, a rotary warp-beam receivingmember journaled in the support and rojecting from the side thereof nextto the rame, and warp controlled means on the support to releasably holdsaid member from rotation, said frame having a bearingl forsaid memberopen laterally of the axis of the latter and said support beingremovably supported on the frame.

3. In combination, a loom frame, a unitary structure arranged beside andremovable from the frame and comprising a support, rotary meansjournaled in the support and including a rotary warp-beam-receivingmember having means tovseparably interlock it With the beam for rotationtherewith, and warp-controlled means on the sup ort to releasably holdsaid -rotary means rom rotation.

In testimony whereof I aiiix my signature.

l WILLIAM' S. WELLS.

